Similar to their Top Fuel counterparts but with a shorter wheelbase and a carbon-fiber body that loosely resembles a production-based automobile, Funny Cars routinely run in the 4.7-second range and are capable of speeds in excess of 530 km/h (330 mph). Funny Cars are powered by the same supercharged and fuel-injected 500-cubic-inch engines as Top Fuel dragsters. Funny Cars are also similar to Top Fuel dragsters in that they do not use a transmission but rather transmit power to the huge rear slicks through a multistage clutch assembly that is activated by timers.